MDI task list for GLD

Priority has been determined by the ILC-WG4 parameters which will be chosen at the SNOWMASS. The ILC-WG4 has a charge of designing the beam delivery system; i.e. from the end of LINAC through the beam dump including the interaction region(IR). The tasks are listed in the priority order as follows.

I . First priority :

I-1. Crossing angle: what is the best angle; i.e. 0, 2 and 20mrad ?

Following issues should be investigated with the above three angle cases.
  1. stau-pair production, (ee)tau tau background rejection by mini-veto angle
  2. comparison of backgrounds for 2/20mrad crossing, three detectors (SiD, LCD, GLD) background: synchrotron radiations, pairs, neutrons, Xrays
  3. choice of final doublet; i.e. super, permanent (hybrid) and iron
  4. option: geometry package of e-e- and gamma gamma colliders with laser cavities
    Does GLD accept the option of gamma-gamma collisions?

I-2. Determination of L* ; distance of the front face of final quasrupole magnet (FQ) from IP

  1. How to verify 4.5m in comparison with 3.5m, if L*=4.5m is chosen at GLD ? in terms of backgrounds, support of final-Q
  2. Stabilization of the FQ
    - how to support the FQ; e.g. on the iron wall, support tube, optical anchor ?

I-3. Simulation of background from the BDS based on the LCBDS(BDSIM) and Jupiter

  1. LCBDS manual for users and homepage, cross-check with the UK-version
  2. Tolerable level of each background ( muons, radiation, pairs etc. )
  3. muons, synchrotron radiation v.s. collimation depth for CAL, VTX
  4. backscattered background (photons, e+/-, neutrons) from the extraction line with the beam dump

II Next priority

II-1. Beam parameter choice; are all the parameter sets acceptable ?

1-1) Preparation of 4 parameter sets to CAIN of beam-beam simulation at IP

i.e. nominal, Low Q(half beam intensity), Large Y(large vertical beam size), Low P (less beam power) and High luminosity, where the former 4 sets has the same luminosity.

1-2) background simulation with the above 4 sets